U.S. Geological Survey
Water Resources of the United States
Water is one of seven science mission areas of the U.S. Geological Survey (USGS). Water's mission is to collect and disseminate reliable, impartial, and timely information that is needed to understand the Nation's water resources.
Current Real-time Streamflow Conditions
Study Estimates about 2.1 Million People using Wells High in Arsenic
The USGS Water Science School
Water Data for the Nation